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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Employee Benefit Plans EMPLOYEE BENEFIT PLANS
DEFINED BENEFIT RETIREMENT PLANS
Duke Energy and certain subsidiaries maintain, and the Subsidiary Registrants participate in, qualified and non-qualified, non-contributory defined benefit retirement plans. Duke Energy's policy is to fund amounts on an actuarial basis to provide assets sufficient to meet benefit payments to be paid to plan participants.
QUALIFIED PENSION PLANS
The following tables include the components of net periodic pension costs for qualified pension plans.
 
Three Months Ended September 30, 2020
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
41

 
$
12

 
$
12

 
$
6

 
$
5

 
$
1

 
$
2

 
$
1

Interest cost on projected benefit obligation
67

 
16

 
21

 
10

 
12

 
4

 
6

 
2

Expected return on plan assets
(143
)
 
(36
)
 
(48
)
 
(22
)
 
(25
)
 
(7
)
 
(11
)
 
(5
)
Amortization of actuarial loss
32

 
7

 
10

 
4

 
6

 
2

 
3

 
2

Amortization of prior service credit
(8
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

 
(2
)
Amortization of settlement charges
11

 
6

 
5

 
5

 
1

 
—

 
1

 
1

Net periodic pension costs
$
—

 
$
3

 
$
—

 
$
3

 
$
(1
)
 
$
—

 
$
1

 
$
(1
)
 
Three Months Ended September 30, 2019
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
42

 
$
13

 
$
13

 
$
7

 
$
5

 
$
1

 
$
2

 
$
1

Interest cost on projected benefit obligation
77

 
17

 
24

 
10

 
14

 
5

 
6

 
2

Expected return on plan assets
(140
)
 
(36
)
 
(45
)
 
(22
)
 
(22
)
 
(7
)
 
(11
)
 
(5
)
Amortization of actuarial loss
28

 
6

 
10

 
4

 
6

 
2

 
3

 
2

Amortization of prior service credit
(8
)
 
(2
)
 
(1
)
 
—

 
—

 
—

 
—

 
(2
)
Net periodic pension costs
$
(1
)
 
$
(2
)
 
$
1

 
$
(1
)
 
$
3

 
$
1

 
$
—

 
$
(2
)

 
Nine Months Ended September 30, 2020
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
124

 
$
38

 
$
36

 
$
20

 
$
16

 
$
3

 
$
6

 
$
4

Interest cost on projected benefit obligation
202

 
47

 
64

 
29

 
35

 
12

 
17

 
7

Expected return on plan assets
(429
)
 
(108
)
 
(143
)
 
(66
)
 
(76
)
 
(21
)
 
(32
)
 
(16
)
Amortization of actuarial loss
96

 
21

 
30

 
13

 
17

 
5

 
9

 
7

Amortization of prior service credit
(24
)
 
(6
)
 
(2
)
 
(1
)
 
(1
)
 
—

 
(1
)
 
(7
)
Amortization of settlement charges
16

 
8

 
6

 
6

 
1

 
—

 
1

 
1

Net periodic pension costs
$
(15
)
 
$
—

 
$
(9
)
 
$
1

 
$
(8
)
 
$
(1
)
 
$
—

 
$
(4
)
 
Nine Months Ended September 30, 2019
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
116

 
$
37

 
$
34

 
$
19

 
$
15

 
$
3

 
$
6

 
$
4

Interest cost on projected benefit obligation
242

 
58

 
76

 
34

 
41

 
14

 
19

 
8

Expected return on plan assets
(426
)
 
(111
)
 
(134
)
 
(66
)
 
(66
)
 
(21
)
 
(32
)
 
(16
)
Amortization of actuarial loss
77

 
17

 
28

 
10

 
18

 
3

 
6

 
5

Amortization of prior service credit
(24
)
 
(6
)
 
(2
)
 
(1
)
 
(1
)
 
—

 
(1
)
 
(7
)
Net periodic pension costs
$
(15
)
 
$
(5
)
 
$
2

 
$
(4
)
 
$
7

 
$
(1
)
 
$
(2
)
 
$
(6
)

NON-QUALIFIED PENSION PLANS
Net periodic pension costs for non-qualified pension plans were not material for the three and nine months ended September 30, 2020, and 2019.
OTHER POST-RETIREMENT BENEFIT PLANS
Net periodic costs for OPEB plans were not material for the three and nine months ended September 30, 2020, and 2019.